Heterogeneous organometallic catalysts containing a supported titanium compound and at least one other supported organometallic compound
AssigneeThe Dow Chemical Company
InventorsWilliam M. Coleman, III, Gregory F. Schmidt, Richard E. Campbell, Jr., Mark S. Delaney
Life of this patent
Estimating the term…
Abstract
Catalyst compositions are disclosed which are a combination of a supported titanium compound such as titanium tetraisopropoxide supported on magnesium dichloride and at least one other supported metallic catalyst such as dicyclopentadienyl zirconium dichloride supported on alumina and a cocatalyst such as aluminoxane. These catalysts are useful in the polymerization of .alpha.-olefins.
Claims8
A catalyst composition which comprises ( 1) at least one titanium compound represented by the formula TiR'.sub.x X'.sub.4-x wherein each R' is independently a hydrocarbyl or hydrocarbyloxy group having from about 1 to about 20 carbon atoms;
- X' is a halogen and x has a value from 1 to 4 supported on an inert inorganic support material and (2) at least one organometallic compound represented by the following formula ##STR3## wherein M is selected from the group consisting of Sc, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Y, Zr, Nb, Mo, Ce, Pr, Nd, Th, Pa or U;
- each R is independently hydrogen or a hydrocarbyl group having from 1 to about 10 carbon atoms;
- each X is independently hydrogen, a hydrocarbyl or a hydrocarbyloxy group having from 1 to about 20 carbon atoms, or a halogen, and wherein two of such R groups can be joined so as to form a multiring compound;
- x has a value from 1 to the valence of M minus one and y has a value equal to the valence of M;
- and wherein component (2) is either non-supported or is supported on an inert inorganic support material.
Dependencies are inferred from the claim text.